diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88375783c..962346b17 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,21 @@
 ## [CoreUI](https://coreui.io/) for [react](./REACT.md) changelog
 
+##### `v2.6.0`
+- move to `reactstrap v8`. Breaking changes and deprecations, see: https://github.com/reactstrap/reactstrap/blob/master/CHANGELOG.md#800-2019-04-03
+- fix(DefaultHeader): replace `AppHeaderDropdown` with `UncontrolledDropdown`
+- refactor: add ie polyfills 
+
+###### dependencies update
+- update: `@coreui/coreui` to `^2.1.12`
+- update: `@coreui/coreui-plugin-chartjs-custom-tooltips` to `^1.3.1`
+- update: `@coreui/react` to `^2.5.1`
+- update: `core-js` to `^3.1.4`
+- update: `enzyme` to `^3.10.0`
+- update: `enzyme-adapter-react-16` to `^1.14.0`
+- update: `react-router-config` to `^5.0.1`
+- update: `react-router-dom` to `^5.0.1`
+- update: `reactstrap` to `^8.0.0`
+
 ##### `v2.5.0`
 - release for use with:
   - react-router-dom `~5.0.0`
diff --git a/package-lock.json b/package-lock.json
index 844cb7985..7472297d6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@coreui/coreui-free-react-admin-template",
-  "version": "2.5.0",
+  "version": "2.5.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -895,15 +895,6 @@
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-      "resolved": "https://registry.npmjs.org/@babel/polyfill/-/polyfill-7.4.4.tgz",
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       "resolved": "https://registry.npmjs.org/@babel/preset-env/-/preset-env-7.4.4.tgz",
@@ -1041,19 +1032,20 @@
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-      "resolved": "https://registry.npmjs.org/@coreui/coreui/-/coreui-2.1.9.tgz",
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+      "version": "2.1.12",
+      "resolved": "https://registry.npmjs.org/@coreui/coreui/-/coreui-2.1.12.tgz",
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-        "@babel/polyfill": "^7.4.0",
         "@coreui/coreui-plugin-npm-postinstall": "^1.0.2",
-        "bootstrap": "^4.3.1"
+        "bootstrap": "^4.3.1",
+        "core-js": "^3.1.3",
+        "regenerator-runtime": "^0.13.2"
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-      "resolved": "https://registry.npmjs.org/@coreui/coreui-plugin-chartjs-custom-tooltips/-/coreui-plugin-chartjs-custom-tooltips-1.3.0.tgz",
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+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/@coreui/coreui-plugin-chartjs-custom-tooltips/-/coreui-plugin-chartjs-custom-tooltips-1.3.1.tgz",
+      "integrity": "sha512-ovNE9QygRdB7IkE7gZNRx79lSk77STtNOFS4NRpjljoRcAseR156ZYV0i/dSoiwZwRJ+dHzWeXy1IMcXcdnAww==",
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+      "resolved": "https://registry.npmjs.org/@coreui/react/-/react-2.5.1.tgz",
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       "requires": {
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         "classnames": "^2.2.6",
-        "core-js": "^2.6.5",
+        "core-js": "^2.6.8",
         "prop-types": "^15.7.2",
         "react-onclickout": "^2.0.8",
         "react-perfect-scrollbar": "^1.5.2",
         "reactstrap": "^7.1.0"
+      },
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+            "classnames": "^2.2.3",
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+            "lodash.isobject": "^3.0.2",
+            "lodash.tonumber": "^4.0.3",
+            "prop-types": "^15.5.8",
+            "react-lifecycles-compat": "^3.0.4",
+            "react-popper": "^0.10.4",
+            "react-transition-group": "^2.3.1"
+          }
+        }
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     },
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@@ -2320,12 +2335,12 @@
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-      "integrity": "sha1-VWpcU2LAhkgyPdrrnenRS8GGTJA=",
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@@ -2839,6 +2854,12 @@
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+      "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
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+      "dev": true
     },
     "chrome-trace-event": {
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@@ -4494,9 +4524,9 @@
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+      "resolved": "https://registry.npmjs.org/core-js/-/core-js-3.1.4.tgz",
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@@ -4596,15 +4626,6 @@
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@@ -7469,6 +7491,14 @@
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@@ -11495,6 +11535,7 @@
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@@ -13984,53 +14015,43 @@
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-        "react-popper": "^0.10.4",
+        "react-popper": "^1.3.3",
         "react-transition-group": "^2.3.1"
+      },
+      "dependencies": {
+        "create-react-context": {
+          "version": "0.2.2",
+          "resolved": "https://registry.npmjs.org/create-react-context/-/create-react-context-0.2.2.tgz",
+          "integrity": "sha512-KkpaLARMhsTsgp0d2NA/R94F/eDLbhXERdIq3LvX2biCAXcDvHYoOqHfWCHf1+OLj+HKBotLG3KqaOOf+C1C+A==",
+          "requires": {
+            "fbjs": "^0.8.0",
+            "gud": "^1.0.0"
+          }
+        },
+        "react-popper": {
+          "version": "1.3.3",
+          "resolved": "https://registry.npmjs.org/react-popper/-/react-popper-1.3.3.tgz",
+          "integrity": "sha512-ynMZBPkXONPc5K4P5yFWgZx5JGAUIP3pGGLNs58cfAPgK67olx7fmLp+AdpZ0+GoQ+ieFDa/z4cdV6u7sioH6w==",
+          "requires": {
+            "@babel/runtime": "^7.1.2",
+            "create-react-context": "<=0.2.2",
+            "popper.js": "^1.14.4",
+            "prop-types": "^15.6.1",
+            "typed-styles": "^0.0.7",
+            "warning": "^4.0.2"
+          }
+        }
       }
     },
     "read-pkg": {
@@ -15898,6 +15943,16 @@
       "integrity": "sha512-4WK/bYZmj8xLr+HUCODHGF1ZFzsYffasLUgEiMBY4fgtltdO6B4WJtlSbPaDTLpYTcGVwM2qLnFTICEcNxs3kA==",
       "dev": true
     },
+    "tar": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-2.2.2.tgz",
+      "integrity": "sha512-FCEhQ/4rE1zYv9rYXJw/msRqsnmlje5jHP6huWeBZ704jUTy02c5AZyWujpMR1ax6mVw9NyJMfuK2CMDWVIfgA==",
+      "requires": {
+        "block-stream": "*",
+        "fstream": "^1.0.12",
+        "inherits": "2"
+      }
+    },
     "terser": {
       "version": "3.17.0",
       "resolved": "https://registry.npmjs.org/terser/-/terser-3.17.0.tgz",
@@ -16292,6 +16347,11 @@
         "mime-types": "~2.1.24"
       }
     },
+    "typed-styles": {
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/typed-styles/-/typed-styles-0.0.7.tgz",
+      "integrity": "sha512-pzP0PWoZUhsECYjABgCGQlRGL1n7tOHsgwYv3oIiEpJwGhFTuty/YNeduxQYzXXa3Ge5BdT6sHYIQYpl4uJ+5Q=="
+    },
     "typedarray": {
       "version": "0.0.6",
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
@@ -16757,6 +16817,14 @@
         "makeerror": "1.0.x"
       }
     },
+    "warning": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/warning/-/warning-4.0.3.tgz",
+      "integrity": "sha512-rpJyN222KWIvHJ/F53XSZv0Zl/accqHR8et1kpaMTD/fLCRxtV8iX8czMzY7sVZupTI3zcUTg8eycS2kNF9l6w==",
+      "requires": {
+        "loose-envify": "^1.0.0"
+      }
+    },
     "watchpack": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-1.6.0.tgz",
diff --git a/package.json b/package.json
index 68aef548d..d6b689092 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@coreui/coreui-free-react-admin-template",
-  "version": "2.5.0",
+  "version": "2.5.1",
   "description": "CoreUI React Open Source Bootstrap 4 Admin Template",
   "author": "Łukasz Holeczek",
   "homepage": "https://coreui.io",
@@ -12,16 +12,16 @@
     "url": "git@github.com:coreui/coreui-free-react-admin-template.git"
   },
   "dependencies": {
-    "@coreui/coreui": "^2.1.9",
-    "@coreui/coreui-plugin-chartjs-custom-tooltips": "^1.3.0",
+    "@coreui/coreui": "^2.1.12",
+    "@coreui/coreui-plugin-chartjs-custom-tooltips": "^1.3.1",
     "@coreui/icons": "0.3.0",
-    "@coreui/react": "~2.5.0",
+    "@coreui/react": "^2.5.1",
     "bootstrap": "^4.3.1",
     "chart.js": "^2.8.0",
     "classnames": "^2.2.6",
-    "core-js": "^2.6.5",
-    "enzyme": "^3.9.0",
-    "enzyme-adapter-react-16": "^1.13.0",
+    "core-js": "^3.1.4",
+    "enzyme": "^3.10.0",
+    "enzyme-adapter-react-16": "^1.14.0",
     "flag-icon-css": "^3.3.0",
     "font-awesome": "^4.7.0",
     "node-sass": "^4.12.0",
@@ -30,10 +30,10 @@
     "react-app-polyfill": "^1.0.1",
     "react-chartjs-2": "^2.7.6",
     "react-dom": "^16.8.6",
-    "react-router-config": "^5.0.0",
-    "react-router-dom": "^5.0.0",
+    "react-router-config": "^5.0.1",
+    "react-router-dom": "^5.0.1",
     "react-test-renderer": "^16.8.6",
-    "reactstrap": "^7.1.0",
+    "reactstrap": "^8.0.0",
     "simple-line-icons": "^2.4.1"
   },
   "devDependencies": {
@@ -66,5 +66,9 @@
       "!src/serviceWorker.js",
       "!src/polyfill.js"
     ]
+  },
+  "engines": {
+    "node": ">=8.10",
+    "npm": ">=6"
   }
 }
diff --git a/src/containers/DefaultLayout/DefaultHeader.js b/src/containers/DefaultLayout/DefaultHeader.js
index 43f375418..b6f7054e6 100644
--- a/src/containers/DefaultLayout/DefaultHeader.js
+++ b/src/containers/DefaultLayout/DefaultHeader.js
@@ -1,9 +1,9 @@
 import React, { Component } from 'react';
 import { Link, NavLink } from 'react-router-dom';
-import { Badge, DropdownItem, DropdownMenu, DropdownToggle, Nav, NavItem } from 'reactstrap';
+import { Badge, UncontrolledDropdown, DropdownItem, DropdownMenu, DropdownToggle, Nav, NavItem } from 'reactstrap';
 import PropTypes from 'prop-types';
 
-import { AppAsideToggler, AppHeaderDropdown, AppNavbarBrand, AppSidebarToggler } from '@coreui/react';
+import { AppAsideToggler, AppNavbarBrand, AppSidebarToggler } from '@coreui/react';
 import logo from '../../assets/img/brand/logo.svg'
 import sygnet from '../../assets/img/brand/sygnet.svg'
 
@@ -49,11 +49,11 @@ class DefaultHeader extends Component {
           <NavItem className="d-md-down-none">
             <NavLink to="#" className="nav-link"><i className="icon-location-pin"></i></NavLink>
           </NavItem>
-          <AppHeaderDropdown direction="down">
+          <UncontrolledDropdown nav direction="down">
             <DropdownToggle nav>
               <img src={'../../assets/img/avatars/6.jpg'} className="img-avatar" alt="admin@bootstrapmaster.com" />
             </DropdownToggle>
-            <DropdownMenu right style={{ right: 'auto' }}>
+            <DropdownMenu right>
               <DropdownItem header tag="div" className="text-center"><strong>Account</strong></DropdownItem>
               <DropdownItem><i className="fa fa-bell-o"></i> Updates<Badge color="info">42</Badge></DropdownItem>
               <DropdownItem><i className="fa fa-envelope-o"></i> Messages<Badge color="success">42</Badge></DropdownItem>
@@ -68,7 +68,7 @@ class DefaultHeader extends Component {
               <DropdownItem><i className="fa fa-shield"></i> Lock Account</DropdownItem>
               <DropdownItem onClick={e => this.props.onLogout(e)}><i className="fa fa-lock"></i> Logout</DropdownItem>
             </DropdownMenu>
-          </AppHeaderDropdown>
+          </UncontrolledDropdown>
         </Nav>
         <AppAsideToggler className="d-md-down-none" />
         {/*<AppAsideToggler className="d-lg-none" mobile />*/}
diff --git a/src/index.js b/src/index.js
index e99dad89a..7e1e75c74 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,5 +1,6 @@
 import 'react-app-polyfill/ie9'; // For IE 9-11 support
-import 'react-app-polyfill/ie11'; // For IE 11 support
+import 'react-app-polyfill/stable';
+// import 'react-app-polyfill/ie11'; // For IE 11 support
 import './polyfill'
 import React from 'react';
 import ReactDOM from 'react-dom';
diff --git a/src/polyfill.js b/src/polyfill.js
index 4826bf563..dcc8f1f44 100644
--- a/src/polyfill.js
+++ b/src/polyfill.js
@@ -1,6 +1,8 @@
 /*
 * required polyfills
 */
+import "core-js";
+import 'core-js/features/set/map';
 
 /** IE9, IE10 and IE11 requires all of the following polyfills. **/
 // import 'core-js/es6/symbol'
@@ -12,12 +14,12 @@
 // import 'core-js/es6/math'
 // import 'core-js/es6/string'
 // import 'core-js/es6/date'
-import 'core-js/es6/array'
+// import 'core-js/es6/array'
 // import 'core-js/es6/regexp'
-import 'core-js/es6/map'
+// import 'core-js/es6/map'
 // import 'core-js/es6/weak-map'
-import 'core-js/es6/set'
-import 'core-js/es7/object'
+// import 'core-js/es6/set'
+// import 'core-js/es7/object'
 
 /** IE10 and IE11 requires the following for the Reflect API. */
 // import 'core-js/es6/reflect'